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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefacf9c2b2b991268a521ef9c1f63006ca40c8face2568c371901a745af2381' 
  AND token = 'b2WS4Dl4mB+ZF0h4aQO3MMyQ4J2i7OVm27m++sntr+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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