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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa5dd79cc285ad284b9605af9a39d66508e4293b74ffb81b9922f6ef5e90513' 
  AND token = '0pcs5CmBUSei09LtDzANLiK1t/Hgr5ZApTkchMHLtBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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