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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7166a6738b8d95b781964c498474c0b92d455d2b0e6411ceb25c1e3a9258f07' 
  AND token = '932eEf+rr4cVVVFK6XD6C67nbtsMsaw05Dq2KKtBaRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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