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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ba7b2383012e25e8f6883e56c821d6e8e2bea88811305bb4b861665228855e' 
  AND token = 'hHs5goUShj9CHu7u8Sv6fL2iUwMj4wceZWkxxIhXFLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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