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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf05a5a9c1f8933215d02ada081d43091c3d125dc96f55c2070afdb2348c51c6' 
  AND token = '/HwFCxAReHRuied0mkQ+YsORfZ0ApQL8o67h0KxAUC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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