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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a1b6c1f5e75e49e0092d005052982d632671d3aad6584ea7e86a374cfab15d' 
  AND token = 'HC9MZW1GAbh3Po76WrV07mTNLTREz9VKaLbDF3vCWJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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