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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d3d557303548d117d8d03bf658b293ef89cc57ec08b637d570ae1c5e7c34bd' 
  AND token = 'F41ETyke20b9hjDoUeXy4iZuPJWC+UpwQdUBVO47Jj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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