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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030c40c54f965c55203ff146139bdb47030ddbd3885ee80462c86fe24fe3bbba' 
  AND token = 'oIW+Us9Lc1Cl6tVNgocd8ouLiz+7ocnC3oeO6gi/1Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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