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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57471169434a76ca9c37dcae3e9570141d49903dc3470eba9a90806f32317a0b' 
  AND token = 'nf54hM6FjngT0cb6+UzM0V1ylyzpp6bvyN9TieISRA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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