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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea7713533a423b2374e9ba86fe32bde914fac4ec470b67681569df90f4c6abb' 
  AND token = 'YUc6lxc83e1EH2dsXOkF/bvu3vvWKe1hWEGXXeBWPno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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