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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a3fed3e7a9143182ad1061e48280742283bfb2678288ca6d45e4579192d130' 
  AND token = 'VQR+3lAB9NiLwy7poGO5y5grIXN7TMO3B4bxTPjjllA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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