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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3275e8e9fa89ebff913f27a3f70c1f3672d3e97cd1c966b345886b6e6f1c9ba2' 
  AND token = 'yDTTzvg9ulV2JH1/nA2AX4/2tBFOeABaMqQV81cciXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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