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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e8c65a0b6fd5e934f403625cf2f68dec11b3401ce495d962b7d89a31b270ec' 
  AND token = '10XfvmqFe3N4D6RYODnLvYfrCqID/Fne4LxG2woMR5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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