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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f70983f9687bf52743b532142a7582bf66445c2e77cc71f8155b2d83390c6' 
  AND token = 'qqdFgCzSrWSNXsoWC1LaD0Ka5khlyLcmuar8/LvSIk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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