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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830d617e4707dbaf19956996c1371d08d98b4f992339dce39676e21c80731964' 
  AND token = 'wYC6Yq4yB8Gd66eRPx9ty5+pSUvcr356BbZDheZ4t7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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