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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea0bec39a107862ccd254d69748822bb252fb5eebf47755377f0ad2575b48dc' 
  AND token = 'fVY7XFWc6L8gx8tafo9ImdZ7MPXWknhh0s0bI48YI0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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