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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5008c215f0d4587eb20148c37fe0b8d5414689092e5546be844eec9660a94fa' 
  AND token = 'B0NNDA+2SDSQN+rYfbWb3GCsj8e5cDtdQTwJCFgVCX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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