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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faabd57fa98e5380b538bc41d2c3a0c99e301c337299be070eea5d745356f37' 
  AND token = 'MTgcvQ4xmDX4lL7ogn3akPPEKy6Ls+2crx0i9dF+UTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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