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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2c985fba9e12949cec7871d1abe18a391093f625492ca95aa1c6c439210654' 
  AND token = 'rNVA6pMPxvWvftbX79vvy+UnHPULVePGig4UYL8Grvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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