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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c263f8eb06d8fad076dce3bd3fe3d60a0adef4ee078b85a5bc52e647dbe7c6' 
  AND token = '/60k/6anQLH3cUS2Lw9TVcseUns60auPWEqhnoCrxb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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