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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14db8382984a7b247873dd7e393f5efbab61de9e9d7091fbbee352b35eba287d' 
  AND token = 'hH51wR2/ZxxgkmpYLHK34CsudvgP7IAyN+6+3cbSPno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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