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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ebd85ad7af6fb1a15a65ef6494a2fb344f0dd024cda7e21a555e557a050e7e' 
  AND token = 'kDncxFBxhc0/D52NmH44I9HLbN2RI4XQgo25UF64obQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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