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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faba953b6786a15f9125426a8600159e1e9fc2968b8d4747baf3798b412a5863' 
  AND token = 'gC75il/98XDc0Mdu9k9/rB2ITn6JsCNYFoN7NfD/g4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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