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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d69a0c75d1d4d50c56c601cf0557103b7bf8760677b226050270f9c51cbd82' 
  AND token = '84vZP1SnKo262QpDojR87xXTnM4joM+fzESLMtAPy3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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