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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6e938d6534a7f510f0c783d78c9de3444e1ddf5ca82e405e4a0bb83c4c0150' 
  AND token = 'XmuUGrluU37jtxGFUq4Y+JwQub2c+HWkHZ+QZPLHYG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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