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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdd8cf58c39cec440882b0cc5c9a1340c825e6c02501a560afcd60ec27a122f' 
  AND token = 'D5muRgO9Ic6absDa6PyLBNOhK/XmGschNWv6kLdpPNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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