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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12dfb2d8f9a822de70e5872e7f940d44ce0479d5954bb62d275f0e80994b6fd' 
  AND token = 'Iveci1VZtKZXHv7eqdYXj77IB1N7doXcDeghRu1x8P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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