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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30f82364deecc75cf28eb69de0d57d40f53664ca91e1325e1d5cb3b7deb2442' 
  AND token = 'hSaIHHXXhRXUuYW8//hD69zBcYQgiyyuHtDtc05El5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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