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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66430be76ec5943c3954e681ab7462c87e114872d206dd4f6c4e2d6bc381247c' 
  AND token = '+JiLeaiOM1t6VGhfeMCQLXfAThHQdG/I7uxIeHWagR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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