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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11d5e25e405ff9b7ec994b23aabb0ff8c12c746c5fd68c8386cf7e545a85763' 
  AND token = 'oFzyA+WR1GEa8uWmVx7iH82D7QBUoE79gZB6vMwBcyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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