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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8937c7919a1ecdd93d65439053b2b3e807964d12c79dd84ede11df154f47c1' 
  AND token = '8tC5rlCgwE52urZMQYcNoS2OrH174448y4bCmlrmhIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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