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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fad835bb40d6a44bb62675269d953d242f077fbe15f4f128df0709acaccf055' 
  AND token = 'cYE2tRAyfZwV/tqGf/cP78LkZX3H7asum1q3LMRHiM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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