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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee74133e4029bccbe4966d75fe735c1311040bc9353bb3e6af6091bdaee576a' 
  AND token = 'KiS4g9iJgwvhQKzj3ixw0ToNP3G0fNm/ikkwx74XF4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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