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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd67bf09d4713e8fb25de5f80c55a56f580c67da81f52580c8bc26555ff8bb7' 
  AND token = 'frorAcGYCot8FPOA/vAmxaeM51RAjyDMykUaCia7mLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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