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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75487e454406a4073aad52d0b597b694dc31a72aed480b9d63cda39ea60962ff' 
  AND token = 'GoG1ig2eCepaYowf22Se72gzVoRUJlocTjzAkMQxJ7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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