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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe50da34e7fa4150ff5edbb9aa1ca7ee1367549b720bbba8874310e54345d2b' 
  AND token = 'vj1LGA896S5nefn0VKgGqzjNiiSHD6qZdru186B4c+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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