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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e58823e036f9968546c561811b4eb9ed3954e09cf8267910d4f8cd8b537db7' 
  AND token = 'XAW9BPelEOTjezzcMrnrGa9gQn0u42v93nlZL3DsYxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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