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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3ffc7a1bdb3f4cd821147e087591e2f84f65054ee6e795caca97ee30054dee' 
  AND token = 'PXv9q6EoywKEK1vrOuEoFF0DZzZgXgfPacvundxcsVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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