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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b5d91b08b28872840c6c47b251f9648e1a81d74f1703b1606798670a9adecc' 
  AND token = 'JIm5+jHLftHGaiCUoyTnGKCNKVTK1Qk8O7v7p4uVKMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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