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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4ebc575692bcf65352d3b7029e31cc2ddf8f7dde93628e0e6e10695df56c98' 
  AND token = 'BFbxWV96syUWofTuEgMYGQgVDVuNrqb0waUN9PIbnas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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