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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0017cd4f82ca0a8e88cdcabc388fa0a2a0b34de1810fdb5fcc06a3879ba81d7a' 
  AND token = 'Lm7eqDi6G4dERvreLRu5yuInVI/HOYx29uzL683leCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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