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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60454a0950abcfcd10e64ba483ac6964ecb9edfacb864fc22ad396711cf48ec' 
  AND token = '8e055Ypb99k+YHPQb7bwmLPtdP/sPXJTHX7+dQyqC04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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