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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690dbebe2b2957a025220c42a875bc77b38b9e70f0566c3f6eb862265426ee5c' 
  AND token = 'jYtHeCdTT4L1q34EQExAkpJ2SEoaupXA33oQ3xMaRqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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