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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdbd9b3fd18adc696a6da821f6bdd2e92b14e09f1b293df6c44651b6a22c555' 
  AND token = 'LPjPtktCd0pjKqIEz1rMKzLDIQWnoJx6fGAZq0nOyxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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