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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a5dc2bf5f7879726ba0263695340ecf96786624cbb9a62d62a5af0be12f56a' 
  AND token = 'JBUJOxgT5Sn05yiaNeWwY0TIVHagMpVPgtbMpOQIinM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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