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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e473d4c8203e363960a7d01043f6ccd9d310ed16878705844e5fc005eabe1e8a' 
  AND token = '6Wr1gSlayQtr+OB/rOx0Yc/K3f/RSuwefrAPV38I0ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}