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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0734db05ce1d8d5d8f993b84cd75c9b3d3a5ccb05d4e6e6425beb5b8f19460de' 
  AND token = 'b4MA4fHYf2fHQdvSqcl1ARRCB+dOd369pxgAhRp8JFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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