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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f628ed520c8dda0e7d7d8432490f223d668bdda0b51d97170280c0809293c637' 
  AND token = 'U7g96o05NwsOAskzkAFACFTtkCLULXOC8vZUQzZeelA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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