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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdad49cbe50d481f5af44c44a4363c49d61e5e8e45e6efdd9e39a352955a880d' 
  AND token = 'y4EgRD37gW1rjYKd37Xizb56n5ZGZP097nA5/AsM41c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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