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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1369363902ab9f0a085c2e912db0985f190dbb02a0e3980e30496a5f3e260d84' 
  AND token = 'qkxNzG95PwFUXpoqKKzeG+dGQB7CN4ye4bLZ2/M2VCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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