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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c49b0e62f115913e257d0abd995aa163eb7b2673fc532e2f1a5bb3678d5a4a4' 
  AND token = 'xJ4MFfkNqrt8qLcocnPbDslLs1M6eJgW+L+lQnEWXao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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