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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52ef5a60fd314ad330a1b3547e57ce2ac6e7c27e12be323804b92ccfd844e90' 
  AND token = 'QvLw8oCfh5K0SMarWt4scURUnE2m0NJeHFHhJWNVmu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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