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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9856d0b7bef5cd188bc8ba69e706052ba2e499b7d0ea34557bd40d23711b07d4' 
  AND token = 'ZSfqOe+RD1ww/c/g/O2iUsHsG9MOwse+YajZqzEAg9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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