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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f226e3128872001a570b0c40ea4ecfddfca17f1c60c870495cd7bed25b3029b7' 
  AND token = 'rgK4c8X9joNvEMz8a6zmKO5yo+NY55J/Pg2AqIazhpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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