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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e57eff715be1d0f64d8cd0baeb749e448dc9854f6829337d09aa4df1a19bd74' 
  AND token = 'jJq5EPT18web3btBEuqQBfJZkA0F1Smdkfxoih16+bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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