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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8930438db761e9adeed64749ac6c2af9d53fe29e9ecd2d94c30d281ac9e8f10' 
  AND token = 'Pd8B1ONfaO0lNqnxQGVw5TpUej7HwOERK/sRSVUYtZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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