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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faf2e65a0ef4479bc6bee7fe765401c9636ee45693152bb9e856d773d955bf9' 
  AND token = 'ivDra4e/dDMeUKYvcMluLsxLCHi3MP7ihUFW9YetFIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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