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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027bd790268280d5f756924418dd760f35c16371f4a2e0a59f075cd1488d7f4c' 
  AND token = 'ZsEr3LDmbc3J3YhEaidY2oTiWt15fpFjIY1daReGLyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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