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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31a34df56b2ebca7a1439dea34de051023302143d9e5de8102e1ec83a07beb8' 
  AND token = '7p8kFb9zsDq2Zj9o2SS/qxR0UD/ipiF7GG/Df2LswOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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