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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b113c7714b3ec340cebd127ab5f7e42fc848f4846961e05d26e259bd4bfdfa80' 
  AND token = 'NmMzSZtlk5g8nC/HLgIthpEbg59PCfkEBfjyFj2dy/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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