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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf020fa0165dea17c5fd58745f153e674a9638fe20fab19823eefb812abcfe63' 
  AND token = '9c1iOyZBrTgYvI15Bwt5LN//2ViBT+wCMv7hepHUi84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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