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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c13f47d1117c20273fe33d379003c9c53e4572f84f871ee6eca6f8839ee006' 
  AND token = '96/8JKL3NECtE+PKQqtC9TumzxuZKXP9ZZ7eotkdltk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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